Dental composites are tooth-coloured restorative material used by dentists for various applications. Restoration of a lost tooth structure requires a material having mechanical as well as aesthetic properties similar to that of tooth. This poses challenges to engineers and the dentist alike. Dental composites consist of a matrix and a dispersed phase called filler, which are mainly responsible for its mechanical properties. Most commonly used matrix is bisphenol glycidyl methacrylate (Bis-GMA) and triethylene glycol dimethacrylate (TEGMA). Silica and glass are conventional fillers used in the past. Recently, zirconia is being used due to its improved mechanical properties. A study was conducted to evaluate the contribution of zirconia to the mechanical properties in general and compressive strength in particular. We have attempted to make an experimental dental composite with a conglomerate of nanofillers, namely, zirconia, glass and silica, and optimize this filler volume percentage and obtain an optimum compressive strength for the experimental dental composite.

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Background: Probiotics consist of live microbes. They do not have any adverse effects on health. They provide nutritive benefits to individuals when ingested in adequate quantities. The most common oral infections of the oral cavity are those affecting the periodontal and dental tissues. Aims and Objectives: 1) To evaluate the antimicrobial role of oral probiotics against microorganisms involved in infections of periodontal and dental tissues. 2) To evaluate the state of health of gingival and periodontal tissues of children undergoing chemotherapy after the use of oral probiotics. Materials and Methods: 60 children, between the age group of 3 and 15 years, undergoing chemotherapy were randomly distributed under control and probiotics administered test group for 90 days. The gingival, periodontal, and oral hygiene statuses were evaluated along with their caries activity test. The parameters were measured at 0, 15, 30, 45, 60, 75, and 90 days intervals. Statistical analysis was performed using Statistical Package for the Social Sciences version 18.0. Results: The oral probiotics consumption significantly reduced the plaque accumulation between days of observation among those in the treatment group (P < 0.05). There was a significant improvement in the gingival and periodontal status in the tested group (P < 0.05). Snyder test was conducted to assess caries activity. Score 1 was found in 10 children, score 2 in eight children. Score 3 was not found in any child under the study group. Conclusion: The results show that the regular consumption of oral probiotics significantly reduces plaque accumulation, calculus formation, and caries activity among the test group.

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Chewing food is a dynamic and continuous process. tooth is an important component which can not be neglected. Accordingly to WHO(world health organization) report nearly 100% people have decay once in life. Decay can be filled with gold, silver amalgam. Composites have advantages by providing natural colour of tooth, less tooth removal required to fill cavity and natural tooth structure can be maintained. The aim of this work is to present an analysis of the composites and furnish dentists with a basis that can provide criteria for choosing one or another to suit their treatment. The mechanical properties of composite resins are importantly depends upon filler content. Dental composites are using silica, quartz and alumina glass as filler for long time. Zirconia is the latest addition as filler. Chewing of food is a dynamic situation in which many forces are acting in all possible direction, the most important being the flexural force. Our aim is to optimise the flexural strength in Zirconia nanoclusters of the Bis-GMA & TEGDMA based dental composites. The aim of work is to find out best combination of composite material.